Removable ceiling for enameling-ovens.



Patented Sept. 10, 191.2.v

@w- 1 e y t. Reovexwwevwc. .-4 4wd Mm GEORGE WILLIAM HIZEE, or DETROIT,MICHIGAN.

REMOVABLE CEILIG FOR ENAMELINGOVENS.

Specification of Letters Patent. y

Patented Sept. 10, 1912.

, Application 1e`d October 2, 1911. Serial No. 652,338.

To all whom it may concern:

Be it known that I, GEORGE W. HIZER, a citizen of the United States, anda resident of Detroit, in the county of Wayne and State of Michigan,have invented a new and useful Removable Ceiling for Enameling- Ovens,of which the following is a specification.

This invention relates to means for pre-k venting flakes or smallgranules of soot or other undesirable materials from falling from theceilings of enameling ovens onto the wet enamel coating of sheet metal,and its object is to provide a removable false ceiling for such ovens,which ceiling can be easily and thoroughly cleaned when desired.

In the accompanying drawings Figure l is a perspective view of anenameling oven. Fig. 2 is a transverse section, and Fig. 3 is alongitudinal section of the same. Fig. 4 is a detail of a small hangerwhich may be employed in this oven.

Similar reference characters refer to like parts throughout the severalviews.

The enamel on mud-guards, hoods, and

bodies of automobiles, and of other high-k class sheet metal work, isbaked onto the metal in ovens which are heated to a temperature of from250 to 350 degrees Fahrenheit. This heating is done, as ka rule, bymeans of gas flames, and because of imperfect combustion, a certainamount of lampblack or soot is formed. l This lamp-black or soot seemsto unite with the vapors of the solvent of the enamel and attachesitself to the walls and ceiling of the oven. After several months, smallparticles of this material detach themselves from the ceiling and fallonto the soft enamel of the goods within the oven. The result is thatspecks, warts, and blisters vare formed on the enamel, oftennecessitating the entire removal of the enamel by means of a-hot acidbath. Y

It is customary to periodically clean the ceiling and the supportingbars by means of wire brushes and thorough scrubbing, but for somereason not understood, a perfect rain of such particles falls during thefirst and often second baking following such cleaning. The probabilityis, that these fine particles are pushed into the cracks and betweenoverlapping plates which forxn the ceiling, during the cleaning, and arethen released during the baking because of the expansion and othermovement of the ceill ing plates due to .the great increase intemperature. Whatever be the reason, it is the universal experience ofthose skilled in this art, that the enamel ofsubstantially the entirebatch of the articles being enameled at the first baking following acleaning of the oven, is imperfect, and it is also the universalexperience that a very large proportion of such articles must berenameled.

The invention set forth in this application is embodied in a false orremovable ceiling which can be absolutely cleaned. The preferred form isa series of sheet metal plates overlapping at edges and ends, and ofsuch length that they can be easily taken out of the oven and put into ahot bath of weak acid, which removes every trace of the soot and otherundesirable materials.

The oven shown in the accompanying drawing has a top 1, sides 2, bottom3, front 4, back 5 and doors 6 of any desired material and construction.The heating gas is conducted into the oven by means'of pipes 7 andescapes through the small holes 8 shown in Fig. 1. .The flow may becontrolled by valve 9. Extending across between the walls 2 aresupporting members 10, preferably I- beams, upon which rest a series ofmetal plates 11 having upturned edges 12, and the second series ofplates 13 having downturnededges 14. These plates maybe of any desiredlength, and overlap, the outer ends of the end plates preferably restingon channels 15 secured to the back 5 and the front 4 of the oven. Smallstirrups 16 may carry the bars 17, andthe hooks 18 hang over these bars17 and support the pieces 19 of work, mudeguards being shown. As thesestirrups 16 are easily removable, the bars 17, which may be also formedof short lengths, can also be taken down and placed in the acid bath.The I-beams 10 may then berushed and if desired washed with weak aci Ithas been found that in ovens provided with false ceilings such as shownin the drawing, the consumption of gas is much less than in those not soprovided, owing to the fact that a dead air space is formed between thetop of the oven and the sheet metal ceiling, which space substantiallyprevents the radiation of the heat upward. The plates 11 and 13 will becleaned as often y as necessary to prevent too great an accunecton withI-beams 1 0, for the plates may` be of any desired shape and Vsize andthe supporting beams may be of any Cross section.

what I cla-iin as. my invention anddesire to secine by Letters Patent isIn an enameling even, the combination With the sides, and top of theoven, of a series of beamsv extending across, the' oven and Having nowexplained my constructionf spacedfrom theltop, a seijies of removableofstnjinps depending from said beams, and

having. overlapping edfes and ends, a series of stirrups Vdepencln'igafseijiesof removable bars carried by said ystifups, said bars adaptedto receive the Irene said bea-Ins, and

supporting hooks of the metal articles being enanele'd.

Intestimony whereof, I have signed this application in the presence oftWo subscribing Witnesses.

l ,GEORGE WILLIAM HIZER. Witnesses HARRY RANGER,

GEO. F. STANDLEY.

Copies of this patent maybe obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.` p V l

